Polymers,
Год журнала:
2024,
Номер
16(22), С. 3199 - 3199
Опубликована: Ноя. 18, 2024
Nanocellulose
has
prompted
extensive
exploration
of
its
applications
in
advanced
functional
materials,
especially
humidity-responsive
materials.
However,
the
sunflower
pith
(SP),
a
unique
agricultural
by-product
with
high
cellulose
and
pectin
content,
is
always
ignored
wasted.
This
work
applied
sulfuric
acid
hydrolysis
sonication
to
obtain
nanocellulose
construct
film
materials
properties.
The
SP
nanoparticle
(SP-NP)
suspension
could
form
transparent
stacked
layers
laminated
structure.
Due
tightly
layered
structure
expansion
confinement
effect,
when
humidity
increases,
SP-NP
responds
rapidly
just
0.5
s
completes
full
flipping
cycle
4
s,
demonstrating
excellent
capability.
After
removing
hemicellulose
lignin,
nanocrystals
(SPC-NC)
self-assemble
into
chiral
nematic
film,
displaying
various
structural
colors
based
on
different
times.
color
SPC-NC
dynamically
adjusted
changes
ambient
humidity,
exhibiting
both
functionality
aesthetics.
research
provides
new
perspective
high-value
utilization
while
establishing
practical
foundation
for
developing
novel
responsive
cellulose-based
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 31, 2024
Abstract
The
self‐assembled
cellulose
nanocrystal
(CNC)
film
has
a
left‐handed
layered
structure,
which
makes
the
reflection
of
right‐handed
circularly
polarized
(CP)
light
challenge.
Herein,
nematic
phase
layer
is
designed
and
inserted
into
chiral
organization,
to
work
as
half‐wave
retarder
make
ambidextrous
CP
reflection.
maximum
reflectivity
exceeds
80%,
breaks
50%
limitations
single‐direction
current
in
all
reported
CNC‐based
films.
This
“sandwich‐like”
structure
displays
different
optical
properties
on
both
sides,
displayed
chromatism
inversion
circular
dichroism
signals.
dual
direction‐dependent
phenomena
are
reserved
synthesized
luminescence
(CPL)
film,
with
dissymmetry
factor
(
g
lum
)
−0.4245.
However,
this
luminescent
intensity
emission
not
enough
advanced
systems.
designs
triple
CPL
amplification
path
develops
handedness
strategy,
−1.0551
0.4082.
Then,
dual‐directional
films
designed,
where
optics
can
be
switched
on‐demand.
Finally,
photonic
crystal
applied
anti‐counterfeit
superstructure
induction.
Chemistry of Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 17, 2024
Inspired
by
the
Chameleon's
skin
with
tunable
color
and
flexibility,
this
work
designs
a
ternary
supramolecular
ensemble
(cellulose
nanocrystals-poly(ethylene
glycol)
acrylate-pentanediol)
to
biomimic
unique
inner
structure.
The
incorporated
flexible
additives
form
compact
hydrogen-bonding
percolating
network,
which
ensures
excellent
mechanical
properties
optical
sensitivity.
film
almost
covers
entire
visible
region
tuning
photonic
bandgap.
can
respond
multiple
stimuli,
including
humidity,
wetting
gas,
solvent,
pressure,
corresponding
chromaticity
variation
reflects
degree
of
stimulation.
Besides,
shape
varies
in
curves
one
side
when
exposed
gas
recovers
upon
drying.
External
pressure
makes
structure
shrink
blue-shift,
change
is
related
intensity.
compressed
recover
its
original
state
immersing
it
an
ethanol
solution
evaporating
solvent
slowly.
This
green-manufactured
biofilm
shows
considerable
performance
stimulus-induced
signal
switching,
broaden
applications
displays,
sensors,
coating.
Journal of Colloid and Interface Science,
Год журнала:
2024,
Номер
680, С. 492 - 504
Опубликована: Ноя. 20, 2024
Flexible
photonic
materials
derived
from
cellulose
nanocrystals
(CNCs)
have
attracted
significant
attention,
particularly
in
multifunctional
sensors,
intelligent
detection,
and
anti-counterfeiting
applications.
However,
the
major
bottleneck
with
traditional
CNC
is
provision
of
flexibility
properties
which
often
comes
compromises
optical
properties.
To
address
these
challenges,
we
incorporated
organosolv
lignin
nanoparticles
(LNPs)
polyethylene
glycol
(PEG)
into
films.
LNPs
were
produced
sugarcane
bagasse
using
various
solvents,
resulting
distinct
structural
chemical
properties,
such
as
different
sizes
surface
chemistries.
The
addition
PEG
to
films
led
enhanced
flexibility,
strong
iridescence,
improved
thermal
stability
superior
UV-blocking
performance.
Interestingly,
intercalation
significantly
strain
at
break
by
89.6
%
slight
increase
7.7
23.1
tensile
strength
young's
modulus
respectively.
Additionally,
distinguished
UV-blockage
performance
up
99.9
UVB
region
94
UVA
was
also
achieved
CNC-LNP-PEG
exhibited
varying
responses
several
organic
solvents
HCl
gas
reversible
color
changes.
These
attributed
chemistries
LNPs,
influenced
their
interactions
matrix
through
mechanisms
hydrogen
bonding
hydrophobic
interactions.
This
study
highlights
potential
composite
for
advanced
applications
safety
measures,
demonstrating
importance
formulation
processing
conditions
achieving
desirable
Abstract
Currently,
circularly
polarized
luminescence
(CPL)
has
drawn
wide
interest
in
3D
display,
information
storage,
and
optical
sensing.
However,
traditional
synthetic
paths
are
often
accompanied
by
low
chiral
intensity
complex
processes.
Cellulose
nanocrystals
(CNCs),
with
the
properties
of
liquid
crystals,
can
spontaneously
arrange
into
left‐handed
layered
nanofilm,
which
enables
them
candidates
construction
CPL
materials.
Following
this
approach,
work
reviews
synthesis
cellulose‐based
luminescent
The
co‐assembly
technique,
situ
intercalation
strategy,
defect
destruction
design
efficient
encapsulating
luminophores
CNC
organization.
Next,
various
strategies
on
regulation,
including
matching
photonic
bandgap,
pathway
design,
tailored
helical
structure,
summarized.
These
offer
new
sights
control,
mainly
focusing
amplification
inversion
signals.
Multimodal
convertible
chiroptical
signals
enable
films
practical
values
anti‐counterfeit,
sensing,
handedness
induction.
Overall,
timely
overview
summarizes
synthesis,
application
materials,
aims
to
inspire
development
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 25, 2024
Abstract
Developing
a
sustainable
security
module
with
multiple
optical
states
is
important
to
deter
counterfeits,
but
challenging.
This
work
designs
kind
of
chiral
luminescent
film
through
the
co‐assembly
CNCs
and
d‐glucose,
simultaneously
doped
lanthanide
complex
organic
dye.
Superior
mechanical
performance
makes
it
undertake
various
deformations,
including
twist,
tension
without
breaking.
Meanwhile,
this
has
unique
characteristics.
On
one
hand,
chiroptical
signals
can
be
manipulated
matching
photonic
bandgap
fluorescence
peak.
other
due
two
luminophores,
displays
excitation
wavelength
(Ex)‐dependent
circularly
polarized
luminescence
properties.
Under
Ex
275
nm,
integrates
large
dissymmetry
factor
−0.3898,
high
quantum
yield
69.19%,
considerable
lifetime
1381
µs,
which
exceeded
most
reported
assemblies.
These
multimodal
convertible
optics
endow
practical
applications
in
anti‐counterfeit.
It
designed
as
label
or
used
written
paper
encrypt
information.
Even
humid
surroundings,
effect
still
ensured.
